Unsynchronized video and audio might be the result of various misconfigured settings of one or another application. It might be also an internal bug in the operating system.

First, you need to identify where and when the issue appears. If you are having playing videos properly in one browser, try reinstalling Flash Player in the browser. For example, you can restart in in Chrome like this:

Type chrome://plugins into the search bar and press Enter.

Locate Flash in the list and click Disable below the link.

Now visit the following link: http://get.adobe.com/flashplayer/

Unmark checkboxes to install optional programs.

Click on the Download now button.

After a file will be downloaded, run the file and follow instructions.

Furthermore, make sure that your system has installed latest Windows updates. Perhaps during a major installation of a program or an update, your audio and video drivers have become corrupted. Here are a couple of solutions you might try. In addition, you should ensure that your system is malware-free. In some cases, elaborate trojans meddle with the audio or video settings. Scan the system with Reimage.

Option 1. Reinstall audio drivers

To restore your computer's peak performance, you have to purchase licensed version of Reimage Reimage repair software.

You might try uninstalling audio drivers. Note that Windows 10 users have a privilege. After they uninstall the audio drivers and reboot the system, the OS will automatically download and install the necessary drivers.

Type Device Manager in the search box.

Launch the program.

Find sound, video and game controllers. Expand it.

Right click on each entry and choose Uninstall.

Close the program and restart the device.

Option 2. Change video settings in the account of a video streaming site

To restore your computer's peak performance, you have to purchase licensed version of Reimage Reimage repair software.

If you notice the audio and video synchronization failure only in one video streaming sites or app, you may check the following solution. The merits for this solution go to rhagedorn user. Let us take Netflix as an example.

In the Netflix account, go to the bottom.

Click on Help Center.

Choose Internet Connection Speed Recommendations.

Select Video Quality.

Choose Medium (optional).

Remove the checkmark from the box indicating Prefer HTML5 player instead of Silverlight.

Go to Performance tab. Opt for Drop Frames to Keep Audio and Video Synchronized, mark the box to activate the function. Place the checkmark on the Turn on DirectX Video Acceleration for WMV files box.

Click Apply and then OK. Restart Windows Media Player and open a video file.

Note that if your Internet speed is lower than 15-50 Mbps, watching movies on the highest HD settings might result in the audio and video synchronization failure.

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